Depressed fast response action potential | Article about depressed fast response action potential by The Free Dictionary
https://encyclopedia2.thefreedictionary.com/depressed+fast+response+action+potential
Printer Friendly
Dictionary, Encyclopedia and Thesaurus - The Free Dictionary 12,660,986,219 visitors served
Search / Page tools
?
Keyboard
  • A
  • A
  • A
  • A
Language:
Share on Facebook Twitter
Get our app
Flashcards ?
My bookmarks ?
+ Add current page to bookmarks
9
Register Log in
Sign up with one click:
  • Facebook
  • Twitter
  • Google
Share on Facebook
Get
our app
  • Dictionary
  • Thesaurus
  • Medical
    Dictionary
  • Legal
    Dictionary
  • Financial
    Dictionary
  • Acronyms
  • Idioms
  • Encyclopedia
  • Wikipedia
    Encyclopedia
Tools
  • A
  • A
  • A
  • A
Language:
Mobile Apps:
  • apple
  • android
For surfers:
  • Free toolbar & extensions
  • Word of the Day
  • Help
For webmasters:
  • Free content
  • Linking
  • Lookup box
Close

Action Potential

(redirected from depressed fast response action potential)
Also found in: Dictionary, Thesaurus, Medical.

action potential

[′ak·shən pə‚ten·chəl]
(neuroscience)
A transient change in electric potential at the surface of a nerve or muscle cell occurring at the moment of excitation.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

Potential, Action

 

rapid fluctuation of membrane potential arising in response to excitation of nerve and muscle cells or fibers; an active electrical signal by means of which information is transmitted in man and animals.

Action potential is based on rapidly reversible changes in the ionic permeability of the cell membrane that are caused by activation and inactivation of ionic membrane canals. In nerve fibers, the ascending phase of action potential is caused by activation of the rapid sodium canals, and the descending phase by inactivation of these canals and activation of the potassium canals. The same mechanism is reponsible for the generation of action potential in the fibers of vertebrate skeletal muscles.

Activation of the rapid sodium canals in myocardial fibers ensures only the initial surge of action potential: the plateau of action potential characteristic of these fibers is caused by activation of the slow sodium and calcium canals. Rapid sodium canals are not found in the membranes of smooth muscle fibers in the internal organs and blood vessels of vertebrates or in the membranes of muscle fibers of such arthropods as crustaceans and insects and in the membranes of some mollusk neurons. Action potential in these cells is stimulated by activation of the slow sodium and calcium canals or of the slow calcium canals. The descending phase of action potential is maintained by the potassium canals.

Study of the physicochemical properties of ionic canals is important both for interpreting their molecular structure and for developing methods of controlling the generation of action potential in various cells. The rapid sodium canals are specifically blocked by tetrodotoxin, derived from some species of puffer fish of the suborder Tetraodontoidea and from newts of the genus Taricha, as well as by Novocain, cocaine, and other local anesthetics. The slow sodium and calcium and slow calcium canals are not affected by these agents but are blocked by Mn2+, Co2+, Ni2+, and La3- ions and by such organic compounds as isoptin, used in cardiology, and its derivative D-600. Most of the potassium canals are effectively blocked by tetraethylammonium. The effect of action potential on such intracellular processes as the contraction of myofibrils in skeletal, smooth, and cardiac muscles and neurosecretion in some specialized neurons and nerve endings is triggered by the direct action of an electrical impulse on the intracellular structures (Ca2+ is released from the sarcoplasmic network of the muscle) and by the effect on these structures of Ca2+ ions penetrating into the cell during action potential.

B. I. KHODOROV

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.


Want to thank TFD for its existence? Tell a friend about us, add a link to this page, or visit the webmaster's page for free fun content.

Link to this page:

  • Facebook
  • Twitter
Feedback
Flashcards & Bookmarks ?
Please log in or register to use Flashcards and Bookmarks. You can also log in with
  • Facebook
  • Twitter
  • Google
Flashcards ?
My bookmarks ?
+ Add current page to bookmarks
Mentioned in ?
  • accommodation
  • Action Current
  • Action Potentials
  • afterpotential
  • aging
  • All-or-None Law
  • Bioelectric Polarization
  • Bioelectric Potentials
  • cell membrane
  • Chemoreception
  • Chronaxie
  • Conduction of Nerve Impulse
  • Current, Action
  • diffusion
  • Electrophysiology
  • Electrotonus
  • end-plate potential
  • ethology
  • Excitability
Encyclopedia browser ?
  • ▲
  • deposition
  • deposition efficiency
  • deposition potential
  • deposition rate
  • deposition sequence
  • depositional dip
  • depositional fabric
  • depositional sequence
  • depositional strike
  • depository
  • Deposits
  • depot
  • deprecate
  • deprecated
  • deprecated usage
  • Depreciated property
  • depreciation
  • depreciation factor
  • DePree, Max O.
  • DePreist, James
  • depressant
  • depressed
  • depressed arch
  • depressed center car
  • depressed equation
  • depressed fast response action potential
  • depressed fracture
  • depression
  • depression angle
  • Depression Modern style
  • depression spring
  • depression storage
  • depressive
  • depressive neurosis
  • depressor
  • depressor nerve
  • Depressor Reflexes
  • Depressors of Hardness
  • Depressurization
  • depreter
  • Depretis, Agostino
  • Deprez, Marcel
  • deprivation
  • Deprivation of Freedom
  • Deprivation of the Right to Hold Certain Offices
  • depropanization
  • depropanized material
  • depropanizer
  • deproteinize
  • depside
  • depsidone
  • ▼
Full browser ?
  • ▲
  • depress
  • depress
  • depress
  • depress
  • depressant
  • depressant
  • depressant
  • depressant
  • depressantly
  • depressantly
  • depressantly
  • depressantly
  • Depressants
  • Depressants
  • Depressants
  • Depressants
  • depressed
  • depressed
  • depressed
  • depressed
  • depressed
  • Depressed Angle Towed Array Sonar
  • depressed arch
  • depressed arch
  • depressed arch
  • depressed area
  • Depressed Black Gay Men
  • Depressed breastbone
  • depressed center car
  • depressed equation
  • depressed fast response action potential
  • depressed fracture
  • depressed fracture
  • depressed fracture
  • Depressed market
  • Depressed market
  • Depressed Markets
  • Depressed Markets
  • Depressed price
  • Depressed Prices
  • depressed skull fracture
  • depressed skull fracture
  • depressed skull fracture
  • Depressed Towed Array Sonar
  • Depressed Urban Professional
  • depressent
  • depressent
  • depressent
  • depresses
  • depresses
  • depressible
  • depressible
  • depressing
  • depressing
  • depressing
  • depressingly
  • depressingly
  • depressingly
  • depression
  • depression
  • depression
  • ▼
  • Facebook Share
  • Twitter
CITE
Site: Follow:
  • Facebook
  • Twitter
  • Rss
  • Mail
Share:
  • Facebook
  • Twitter
  • LinkedIn
  • Mail
Open / Close
More from Encyclopedia
Mobile Apps
  • Apple
  • Android
  • Kindle
  • Windows
  • Windows Phone
Free Tools
For surfers:
  • Free toolbar & extensions
  • Word of the Day
  • Word Finder
  • Help
For webmasters:
  • Free content
  • Linking
  • Lookup box
  • Terms of Use
  • Privacy policy
  • Feedback
  • Advertise with Us
Copyright © 2003-2021 Farlex, Inc
Disclaimer

All content on this website, including dictionary, thesaurus, literature, geography, and other reference data is for informational purposes only. This information should not be considered complete, up to date, and is not intended to be used in place of a visit, consultation, or advice of a legal, medical, or any other professional.